Question about Cars & Trucks
Usually a PCM just makes the grounds, I don't know if the BCM does the same or what? If I ran power to the pump wire and or made the ground good, would it cause a problem elsewhere? I've been wrenching for 40 years but when they started adding PCM's BCM's, TCM's....it's not as easy as just running a fresh piece of wire from the fuse to the part like it used to be. It's kind of overwhelming how many wires are in a harness anymore, searching for a little cut, pinch or melt can be impossible unless you take the whole car apart! LOL So, anyway, if you can help me on that, I'd appreciate it, I'm not sure what will happen if I just make the ground or run power to it. I don't want to fry the BCM or anything. Thanks, Wayne
GM Fuel Pump Relay Testing Fuel Pump Electrical Circuits Description and Operation
If your missing B+ voltage somewhere , you have high resistance in the circuit ! Do you know how to do voltage drop testing to find high resistance ? If you been wrenchen for 40 years this is something you should know ! Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia
Posted on Dec 08, 2016
Testimonial: "Agreed, I should. 40 years ago I was 10, mom was coming home from work and I could hear the back brakes grinding. She asked, "can you fix that?" I said, "do I have a choice". LOL So I STARTED wrenching 40 years ago I should have said. I've been doing it on and off since I was a kid but mostly parts changing. Thanks for the vids and info, VERY helpful. Wayne"
Hi Wayne, I'm sure your a better mechanic than I, I just looked at your wiring diagram. The control side of relay, that little coil looking sign, it needs voltage and ground, the ground appears to be chassis ground, the voltage comes from pcm. The load side of relay is that line with arrow-head, when relay is energized, that arrow-head moves to other terminal and carries voltage to pump motor. If you use a proper jumper wire on the two terminals, load side of relay, one of those terminals should be hot, if wiring and pump motor are ok, the pump should run. Your bypassing the control side of relay by using jumper.
Posted on Dec 08, 2016
Testimonial: "Ok, it turns out the relay is not activating. If the G6 connection is ground, that would mean I should be getting a positive connection to J7 in order to activate the electromagnet. Am I correct about that? If so, what is that image of G103? Is that body ground? And for the J7 positive connection, where does power come from? Full time positive? PCM positive? I pulled the fuse block apart and found the grey wire but not the dark green/white."
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
Here's a link to this great service
Posted on Jan 02, 2017
Tips for a great answer:
Dec 07, 2016 | 2002 Pontiac Grand Am
Aug 03, 2015 | 1992 Mazda 929
Aug 11, 2017 | 2006 Chrysler Town & Country Touring
Feb 09, 2013 | 1988 Mazda 626
Oct 12, 2012 | 1996 Chevrolet S-10 Pickup
Jul 21, 2012 | 1991 Nissan 300ZX
Nov 07, 2010 | 2003 GMC Sonoma Extended Cab
Aug 15, 2010 | 1999 Chevrolet Silverado 1500
Feb 01, 2009 | 1992 Mitsubishi 3000GT
Aug 05, 2008 | 1999 Ford Taurus
25 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: